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Chinese idiom · 成语

鹬蚌相争

yù bàng xiāng zhēng

The snipe and clam fight; a third party benefits from others’ conflict.

snipe (bird)
clam
mutual
fight, compete

From Strategies of the Warring States (Zhàn guó cè). A snipe and clam fought, and a fisherman caught both, showing mutual loss in disputes.